var ERROR_CONF = {
	KEY_ERR: 311,
	KEY_ERR_MSG: 'key格式错误',
	PARAM_ERR: 310,
	PARAM_ERR_MSG: '请求参数信息有误',
	SYSTEM_ERR: 600,
	SYSTEM_ERR_MSG: '系统错误',
	WX_ERR_CODE: 1000,
	WX_OK_CODE: 200
};
var BASE_URL = 'https://apis.map.qq.com/ws/';
var URL_SEARCH = BASE_URL + 'place/v1/search';
var URL_SUGGESTION = BASE_URL + 'place/v1/suggestion';
var URL_GET_GEOCODER = BASE_URL + 'geocoder/v1/';
var URL_CITY_LIST = BASE_URL + 'district/v1/list';
var URL_AREA_LIST = BASE_URL + 'district/v1/getchildren';
var URL_DISTANCE = BASE_URL + 'distance/v1/';
var EARTH_RADIUS = 6378136.49;
var Utils = {
	/**
	 * 得到终点query字符串
	 * @param {Array|String} 检索数据
	 */
	location2query(data) {
		if (typeof data == 'string') {
			return data;
		}
		var query = '';
		for (var i = 0; i < data.length; i++) {
			var d = data[i];
			if (!!query) {
				query += ';';
			}
			if (d.location) {
				query = query + d.location.lat + ',' + d.location.lng;
			}
			if (d.latitude && d.longitude) {
				query = query + d.latitude + ',' + d.longitude;
			}
		}
		return query;
	},
	/**
	 * 计算角度
	 */
	rad(d) {
		return d * Math.PI / 180.0;
	},
	/**
	 * 处理终点location数组
	 * @return 返回终点数组
	 */
	getEndLocation(location) {
		var to = location.split(';');
		var endLocation = [];
		for (var i = 0; i < to.length; i++) {
			endLocation.push({
				lat: parseFloat(to[i].split(',')[0]),
				lng: parseFloat(to[i].split(',')[1])
			})
		}
		return endLocation;
	},
	/**
	 * 计算两点间直线距离
	 * @param a 表示纬度差
	 * @param b 表示经度差
	 * @return 返回的是距离，单位m
	 */
	getDistance(latFrom, lngFrom, latTo, lngTo) {
		var radLatFrom = this.rad(latFrom);
		var radLatTo = this.rad(latTo);
		var a = radLatFrom - radLatTo;
		var b = this.rad(lngFrom) - this.rad(lngTo);
		var distance = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(radLatFrom) * Math.cos(
			radLatTo) * Math.pow(Math.sin(b / 2), 2)));
		distance = distance * EARTH_RADIUS;
		distance = Math.round(distance * 10000) / 10000;
		return parseFloat(distance.toFixed(0));
	},
	/**
	 * 使用微信接口进行定位
	 */
	getWXLocation(success, fail, complete) {
		wx.getLocation({
			type: 'gcj02',
			success: success,
			fail: fail,
			complete: complete
		});
	},
	/**
	 * 获取location参数
	 */
	getLocationParam(location) {
		if (typeof location == 'string') {
			var locationArr = location.split(',');
			if (locationArr.length === 2) {
				location = {
					latitude: location.split(',')[0],
					longitude: location.split(',')[1]
				};
			} else {
				location = {};
			}
		}
		return location;
	},
	/**
	 * 回调函数默认处理
	 */
	polyfillParam(param) {
		param.success = param.success || function() {};
		param.fail = param.fail || function() {};
		param.complete = param.complete || function() {};
	},

	/**
	 * 验证param对应的key值是否为空
	 * 
	 * @param {Object} param 接口参数
	 * @param {String} key 对应参数的key
	 */
	checkParamKeyEmpty(param, key) {
		if (!param[key]) {
			var errconf = this.buildErrorConfig(ERROR_CONF.PARAM_ERR, ERROR_CONF.PARAM_ERR_MSG + key + '参数格式有误');
			param.fail(errconf);
			param.complete(errconf);
			return true;
		}
		return false;
	},

	/**
	 * 验证参数中是否存在检索词keyword
	 * 
	 * @param {Object} param 接口参数
	 */
	checkKeyword(param) {
		return !this.checkParamKeyEmpty(param, 'keyword');
	},

	/**
	 * 验证location值
	 * 
	 * @param {Object} param 接口参数
	 */
	checkLocation(param) {
		var location = this.getLocationParam(param.location);
		if (!location || !location.latitude || !location.longitude) {
			var errconf = this.buildErrorConfig(ERROR_CONF.PARAM_ERR, ERROR_CONF.PARAM_ERR_MSG + ' location参数格式有误');
			param.fail(errconf);
			param.complete(errconf);
			return false;
		}
		return true;
	},

	/**
	 * 构造错误数据结构
	 * @param {Number} errCode 错误码
	 * @param {Number} errMsg 错误描述
	 */
	buildErrorConfig(errCode, errMsg) {
		return {
			status: errCode,
			message: errMsg
		};
	},

	/**
	 * 
	 * 数据处理函数
	 * 根据传入参数不同处理不同数据
	 * @param {String} feature 功能名称
	 * search 地点搜索
	 * suggest关键词提示
	 * reverseGeocoder逆地址解析
	 * geocoder地址解析
	 * getCityList获取城市列表：父集
	 * getDistrictByCityId获取区县列表：子集
	 * calculateDistance距离计算
	 * @param {Object} param 接口参数
	 * @param {Object} data 数据
	 */
	handleData(param, data, feature) {
		if (feature === 'search') {
			var searchResult = data.data;
			var searchSimplify = [];
			for (var i = 0; i < searchResult.length; i++) {
				searchSimplify.push({
					id: searchResult[i].id || null,
					title: searchResult[i].title || null,
					latitude: searchResult[i].location && searchResult[i].location.lat || null,
					longitude: searchResult[i].location && searchResult[i].location.lng || null,
					address: searchResult[i].address || null,
					category: searchResult[i].category || null,
					tel: searchResult[i].tel || null,
					adcode: searchResult[i].ad_info && searchResult[i].ad_info.adcode || null,
					city: searchResult[i].ad_info && searchResult[i].ad_info.city || null,
					district: searchResult[i].ad_info && searchResult[i].ad_info.district || null,
					province: searchResult[i].ad_info && searchResult[i].ad_info.province || null
				})
			}
			param.success(data, {
				searchResult: searchResult,
				searchSimplify: searchSimplify
			})
		} else if (feature === 'suggest') {
			var suggestResult = data.data;
			var suggestSimplify = [];
			for (var i = 0; i < suggestResult.length; i++) {
				suggestSimplify.push({
					adcode: suggestResult[i].adcode || null,
					address: suggestResult[i].address || null,
					category: suggestResult[i].category || null,
					city: suggestResult[i].city || null,
					district: suggestResult[i].district || null,
					id: suggestResult[i].id || null,
					latitude: suggestResult[i].location && suggestResult[i].location.lat || null,
					longitude: suggestResult[i].location && suggestResult[i].location.lng || null,
					province: suggestResult[i].province || null,
					title: suggestResult[i].title || null,
					type: suggestResult[i].type || null
				})
			}
			param.success(data, {
				suggestResult: suggestResult,
				suggestSimplify: suggestSimplify
			})
		} else if (feature === 'reverseGeocoder') {
			var reverseGeocoderResult = data.result;
			var reverseGeocoderSimplify = {
				address: reverseGeocoderResult.address || null,
				latitude: reverseGeocoderResult.location && reverseGeocoderResult.location.lat || null,
				longitude: reverseGeocoderResult.location && reverseGeocoderResult.location.lng || null,
				adcode: reverseGeocoderResult.ad_info && reverseGeocoderResult.ad_info.adcode || null,
				city: reverseGeocoderResult.address_component && reverseGeocoderResult.address_component.city ||
					null,
				district: reverseGeocoderResult.address_component && reverseGeocoderResult.address_component
					.district || null,
				nation: reverseGeocoderResult.address_component && reverseGeocoderResult.address_component
					.nation || null,
				province: reverseGeocoderResult.address_component && reverseGeocoderResult.address_component
					.province || null,
				street: reverseGeocoderResult.address_component && reverseGeocoderResult.address_component
					.street || null,
				street_number: reverseGeocoderResult.address_component && reverseGeocoderResult
					.address_component.street_number || null,
				recommend: reverseGeocoderResult.formatted_addresses && reverseGeocoderResult
					.formatted_addresses.recommend || null,
				rough: reverseGeocoderResult.formatted_addresses && reverseGeocoderResult.formatted_addresses
					.rough || null
			};
			if (reverseGeocoderResult.pois) { //判断是否返回周边poi
				var pois = reverseGeocoderResult.pois;
				var poisSimplify = [];
				for (var i = 0; i < pois.length; i++) {
					poisSimplify.push({
						id: pois[i].id || null,
						title: pois[i].title || null,
						latitude: pois[i].location && pois[i].location.lat || null,
						longitude: pois[i].location && pois[i].location.lng || null,
						address: pois[i].address || null,
						category: pois[i].category || null,
						adcode: pois[i].ad_info && pois[i].ad_info.adcode || null,
						city: pois[i].ad_info && pois[i].ad_info.city || null,
						district: pois[i].ad_info && pois[i].ad_info.district || null,
						province: pois[i].ad_info && pois[i].ad_info.province || null
					})
				}
				param.success(data, {
					reverseGeocoderResult: reverseGeocoderResult,
					reverseGeocoderSimplify: reverseGeocoderSimplify,
					pois: pois,
					poisSimplify: poisSimplify
				})
			} else {
				param.success(data, {
					reverseGeocoderResult: reverseGeocoderResult,
					reverseGeocoderSimplify: reverseGeocoderSimplify
				})
			}
		} else if (feature === 'geocoder') {
			var geocoderResult = data.result;
			var geocoderSimplify = {
				title: geocoderResult.title || null,
				latitude: geocoderResult.location && geocoderResult.location.lat || null,
				longitude: geocoderResult.location && geocoderResult.location.lng || null,
				adcode: geocoderResult.ad_info && geocoderResult.ad_info.adcode || null,
				province: geocoderResult.address_components && geocoderResult.address_components.province ||
					null,
				city: geocoderResult.address_components && geocoderResult.address_components.city || null,
				district: geocoderResult.address_components && geocoderResult.address_components.district ||
					null,
				street: geocoderResult.address_components && geocoderResult.address_components.street || null,
				street_number: geocoderResult.address_components && geocoderResult.address_components
					.street_number || null,
				level: geocoderResult.level || null
			};
			param.success(data, {
				geocoderResult: geocoderResult,
				geocoderSimplify: geocoderSimplify
			});
		} else if (feature === 'getCityList') {
			var provinceResult = data.result[0];
			var cityResult = data.result[1];
			var districtResult = data.result[2];
			param.success(data, {
				provinceResult: provinceResult,
				cityResult: cityResult,
				districtResult: districtResult
			});
		} else if (feature === 'getDistrictByCityId') {
			var districtByCity = data.result[0];
			param.success(data, districtByCity);
		} else if (feature === 'calculateDistance') {
			var calculateDistanceResult = data.result.elements;
			var distance = [];
			for (var i = 0; i < calculateDistanceResult.length; i++) {
				distance.push(calculateDistanceResult[i].distance);
			}
			param.success(data, {
				calculateDistanceResult: calculateDistanceResult,
				distance: distance
			});
		} else {
			param.success(data);
		}
	},
	/**
	 * 构造微信请求参数，公共属性处理
	 * 
	 * @param {Object} param 接口参数
	 * @param {Object} param 配置项
	 * @param {String} feature 方法名
	 */
	buildWxRequestConfig(param, options, feature) {
		var that = this;
		options.header = {
			"content-type": "application/json"
		};
		options.method = 'GET';
		options.success = function(res) {
			var data = res.data;
			if (data.status === 0) {
				that.handleData(param, data, feature);
			} else {
				param.fail(data);
			}
		};
		options.fail = function(res) {
			res.statusCode = ERROR_CONF.WX_ERR_CODE;
			param.fail(that.buildErrorConfig(ERROR_CONF.WX_ERR_CODE, res.errMsg));
		};
		options.complete = function(res) {
			var statusCode = +res.statusCode;
			switch (statusCode) {
				case ERROR_CONF.WX_ERR_CODE: {
					param.complete(that.buildErrorConfig(ERROR_CONF.WX_ERR_CODE, res.errMsg));
					break;
				}
				case ERROR_CONF.WX_OK_CODE: {
					var data = res.data;
					if (data.status === 0) {
						param.complete(data);
					} else {
						param.complete(that.buildErrorConfig(data.status, data.message));
					}
					break;
				}
				default: {
					param.complete(that.buildErrorConfig(ERROR_CONF.SYSTEM_ERR, ERROR_CONF.SYSTEM_ERR_MSG));
				}
			}
		};
		return options;
	},
	/**
	 * 处理用户参数是否传入坐标进行不同的处理
	 */
	locationProcess(param, locationsuccess, locationfail, locationcomplete) {
		var that = this;
		locationfail = locationfail || function(res) {
			res.statusCode = ERROR_CONF.WX_ERR_CODE;
			param.fail(that.buildErrorConfig(ERROR_CONF.WX_ERR_CODE, res.errMsg));
		};
		locationcomplete = locationcomplete || function(res) {
			if (res.statusCode == ERROR_CONF.WX_ERR_CODE) {
				param.complete(that.buildErrorConfig(ERROR_CONF.WX_ERR_CODE, res.errMsg));
			}
		};
		if (!param.location) {
			that.getWXLocation(locationsuccess, locationfail, locationcomplete);
		} else if (that.checkLocation(param)) {
			var location = Utils.getLocationParam(param.location);
			locationsuccess(location);
		}
	}
};
class QQMapWX {
	constructor(options) {
		if (!options.key) {
			throw Error('key值不能为空');
		}
		this.key = options.key;
	}
	/**
	 * POI周边检索
	 *
	 * @param {Object} options 接口参数对象
	 * 
	 * 参数对象结构可以参考
	 * @see http://lbs.qq.com/webservice_v1/guide-search.html
	 */
	search(options) {
		var that = this;
		options = options || {};
		Utils.polyfillParam(options);
		if (!Utils.checkKeyword(options)) {
			return;
		}
		var requestParam = {
			keyword: options.keyword,
			orderby: options.orderby || '_distance',
			page_size: options.page_size || 10,
			page_index: options.page_index || 1,
			output: 'json',
			key: that.key
		};
		if (options.address_format) {
			requestParam.address_format = options.address_format;
		}
		if (options.filter) {
			requestParam.filter = options.filter;
		}
		var distance = options.distance || "1000";
		var auto_extend = options.auto_extend || 1;
		var region = null;
		var rectangle = null;
		//判断城市限定参数
		if (options.region) {
			region = options.region;
		}
		//矩形限定坐标(暂时只支持字符串格式)
		if (options.rectangle) {
			rectangle = options.rectangle;
		}
		var locationsuccess = function(result) {
			if (region && !rectangle) {
				//城市限定参数拼接
				requestParam.boundary = "region(" + region + "," + auto_extend + "," + result.latitude +
					"," +
					result.longitude + ")";
			} else if (rectangle && !region) {
				//矩形搜索
				requestParam.boundary = "rectangle(" + rectangle + ")";
			} else {
				requestParam.boundary = "nearby(" + result.latitude + "," + result.longitude + "," +
					distance +
					"," + auto_extend + ")";
			}
			wx.request(Utils.buildWxRequestConfig(options, {
				url: URL_SEARCH,
				data: requestParam
			}, 'search'));
		};
		Utils.locationProcess(options, locationsuccess);
	};
	/**
	 * sug模糊检索
	 *
	 * @param {Object} options 接口参数对象
	 * 
	 * 参数对象结构可以参考
	 * http://lbs.qq.com/webservice_v1/guide-suggestion.html
	 */
	getSuggestion(options) {
		var that = this;
		options = options || {};
		Utils.polyfillParam(options);
		if (!Utils.checkKeyword(options)) {
			return;
		}
		var requestParam = {
			keyword: options.keyword,
			region: options.region || '全国',
			region_fix: options.region_fix || 0,
			policy: options.policy || 0,
			page_size: options.page_size || 10, //控制显示条数
			page_index: options.page_index || 1, //控制页数
			get_subpois: options.get_subpois || 0, //返回子地点
			output: 'json',
			key: that.key
		};
		//长地址
		if (options.address_format) {
			requestParam.address_format = options.address_format;
		}
		//过滤
		if (options.filter) {
			requestParam.filter = options.filter;
		}
		//排序
		if (options.location) {
			var locationsuccess = function(result) {
				requestParam.location = result.latitude + ',' + result.longitude;
				wx.request(Utils.buildWxRequestConfig(options, {
					url: URL_SUGGESTION,
					data: requestParam
				}, "suggest"));
			};
			Utils.locationProcess(options, locationsuccess);
		} else {
			wx.request(Utils.buildWxRequestConfig(options, {
				url: URL_SUGGESTION,
				data: requestParam
			}, "suggest"));
		}
	};
	/**
	 * 逆地址解析
	 *
	 * @param {Object} options 接口参数对象
	 * 
	 * 请求参数结构可以参考
	 * http://lbs.qq.com/webservice_v1/guide-gcoder.html
	 */
	reverseGeocoder(options) {
		var that = this;
		options = options || {};
		Utils.polyfillParam(options);
		var requestParam = {
			coord_type: options.coord_type || 5,
			get_poi: options.get_poi || 0,
			output: 'json',
			key: that.key
		};
		if (options.poi_options) {
			requestParam.poi_options = options.poi_options
		}
		var locationsuccess = function(result) {
			requestParam.location = result.latitude + ',' + result.longitude;
			wx.request(Utils.buildWxRequestConfig(options, {
				url: URL_GET_GEOCODER,
				data: requestParam
			}, 'reverseGeocoder'));
		};
		Utils.locationProcess(options, locationsuccess);
	};
	/**
	 * 地址解析
	 *
	 * @param {Object} options 接口参数对象
	 * 
	 * 请求参数结构可以参考
	 * http://lbs.qq.com/webservice_v1/guide-geocoder.html
	 */
	geocoder(options) {
		var that = this;
		options = options || {};
		Utils.polyfillParam(options);
		if (Utils.checkParamKeyEmpty(options, 'address')) {
			return;
		}
		var requestParam = {
			address: options.address,
			output: 'json',
			key: that.key
		};
		//城市限定
		if (options.region) {
			requestParam.region = options.region;
		}
		wx.request(Utils.buildWxRequestConfig(options, {
			url: URL_GET_GEOCODER,
			data: requestParam
		}, 'geocoder'));
	};
	/**
	 * 获取城市列表
	 *
	 * @param {Object} options 接口参数对象
	 * 
	 * 请求参数结构可以参考
	 * http://lbs.qq.com/webservice_v1/guide-region.html
	 */
	getCityList(options) {
		var that = this;
		options = options || {};
		Utils.polyfillParam(options);
		var requestParam = {
			output: 'json',
			key: that.key
		};
		wx.request(Utils.buildWxRequestConfig(options, {
			url: URL_CITY_LIST,
			data: requestParam
		}, 'getCityList'));
	};
	/**
	 * 获取对应城市ID的区县列表
	 *
	 * @param {Object} options 接口参数对象
	 * 
	 * 请求参数结构可以参考
	 * http://lbs.qq.com/webservice_v1/guide-region.html
	 */
	getDistrictByCityId(options) {
		var that = this;
		options = options || {};
		Utils.polyfillParam(options);
		if (Utils.checkParamKeyEmpty(options, 'id')) {
			return;
		}
		var requestParam = {
			id: options.id || '',
			output: 'json',
			key: that.key
		};
		wx.request(Utils.buildWxRequestConfig(options, {
			url: URL_AREA_LIST,
			data: requestParam
		}, 'getDistrictByCityId'));
	};
	/**
	 * 用于单起点到多终点的路线距离(非直线距离)计算：
	 * 支持两种距离计算方式：步行和驾车。
	 * 起点到终点最大限制直线距离10公里。
	 *
	 * 新增直线距离计算。
	 * 
	 * @param {Object} options 接口参数对象
	 * 
	 * 请求参数结构可以参考
	 * http://lbs.qq.com/webservice_v1/guide-distance.html
	 */
	calculateDistance(options) {
		var that = this;
		options = options || {};
		Utils.polyfillParam(options);
		if (Utils.checkParamKeyEmpty(options, 'to')) {
			return;
		}
		var requestParam = {
			mode: options.mode || 'walking',
			to: Utils.location2query(options.to),
			output: 'json',
			key: that.key
		};
		if (options.from) {
			options.location = options.from;
		}
		//计算直线距离
		if (requestParam.mode == 'straight') {
			var locationsuccess = function(result) {
				var locationTo = Utils.getEndLocation(requestParam.to); //处理终点坐标
				var data = {
					message: "query ok",
					result: {
						elements: []
					},
					status: 0
				};
				for (var i = 0; i < locationTo.length; i++) {
					data.result.elements.push({ //将坐标存入
						distance: Utils.getDistance(result.latitude, result.longitude,
							locationTo[i]
							.lat, locationTo[i].lng),
						duration: 0,
						from: {
							lat: result.latitude,
							lng: result.longitude
						},
						to: {
							lat: locationTo[i].lat,
							lng: locationTo[i].lng
						}
					});
				}
				var calculateResult = data.result.elements;
				var distanceResult = [];
				for (var i = 0; i < calculateResult.length; i++) {
					distanceResult.push(calculateResult[i].distance);
				}
				return options.success(data, {
					calculateResult: calculateResult,
					distanceResult: distanceResult
				});
			};

			Utils.locationProcess(options, locationsuccess);
		} else {
			var locationsuccess = function(result) {
				requestParam.from = result.latitude + ',' + result.longitude;
				wx.request(Utils.buildWxRequestConfig(options, {
					url: URL_DISTANCE,
					data: requestParam
				}, 'calculateDistance'));
			};
			Utils.locationProcess(options, locationsuccess);
		}
	}
};
module.exports = QQMapWX;